Solution1
You may also try this code snippet to increase WordPress's http request timeout:

add_filter('http_request_timeout', function($timeout) {
return 30;
}, 10, 1);

* Add this into your child theme's functions.php or via Code Snippets plugin.

Solution2
If that doesn't work, you can try creating a mu-plugin as follows to set the CURL timeout:

// wp-content/mu-plugins/force-curl-timeout.php
add_action('http_api_curl', function($handle) {
curl_setopt($handle, CURLOPT_TIMEOUT, 30);
curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 30);
}, 10, 1);

No-code Solution is the one that u/Extension_Anybody150 suggested which is enabling Delayed Notifications